. 210 DISEASES OF DOMESTICATED BIEDS Combating lice. Owing to the habit of lice of remaining upon the host, the most direct method of combating them consists of the application of an in- secticide to the bird, Bishopp and Wood favor starting a campaign against lice in the late summer or early fall. The weather conditions are favorable and the amount of stock to be treated is the lowest of any time in the year. There is no reason to prevent a flock from being entirely freed from lice and kept free. These writers conclude that the commercial grade ^^?' ^^', i,r ^^^^ of sodium fluorid is the most
. 210 DISEASES OF DOMESTICATED BIEDS Combating lice. Owing to the habit of lice of remaining upon the host, the most direct method of combating them consists of the application of an in- secticide to the bird, Bishopp and Wood favor starting a campaign against lice in the late summer or early fall. The weather conditions are favorable and the amount of stock to be treated is the lowest of any time in the year. There is no reason to prevent a flock from being entirely freed from lice and kept free. These writers conclude that the commercial grade ^^?' ^^', i,r ^^^^ of sodium fluorid is the most satisfactory agent to louse {Menopon . . , ,. hiseriatum) : use agamst lice. It kills lice m all stages including Male, top view, {j^q^q hatchine; subsequent to its application. They Greatly enlarged. ^ . ^ „,/ ^ t ^ • i (Bishopp and apply the agent m two ways. When applied m the ^"^'^^ powdered form, the bird is held in a pan to catch superfluous powder. They apply one pinch on the head, one on the neck, two on the back, one on the breast, one below the vent, one on the tail, one on either thigh and one scattered on the inner side of each wing when spread. They recommend this method of applica- tion for newly hatched birds and sick birds exclusively. The action of the powdered sodium fluorid is comparatively slow, but it remains on the bird, and in four or five days all lice will disappear. The dust is somewhat irritating to the air passages and the operator should wear a dust protector over the mouth and nostrils. The powder causes a transitory effect only on the air passages of the treated birds. The method costs about $ per hundred fowls, calculating the man's time at 20 cents per hour. Applying the agent in solution by dipping has the advantage in reducing cost of materials and is more rapidly done, without discom- fort to the operator. Furthermore, the lice die very promptly after being touched by the fluid. The first requisite is a warm, sunny day so that t
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